negative symptoms psychosis 2 schizophrenia 2 Adult 1 Affiliative Conversation Task 1 Article 1 Bleuler 1 Humans 1 Interpersonal Relations 1 Male 1 Middle Aged 1 Pilot Projects 1 Psychotic Disorders 1 Schizophrenia 1 Schizophrenic Psychology 1 Social Affiliation Interaction Task 1 Social Behavior 1 Social Skills 1 Video Recording 1 adult 1 affiliation 1 assessment 1 associative learning 1 behavior assessment 1 clinical high risk 1 comparative study 1 computer assisted tomography 1 concurrent validity 1 controlled study 1 convergent validity 1